Gear pump



March 12, 1929. A. E. GRANT 1,704,704

GEAR PUMP Filed Aug. 8, 1927 Inn 0 P B P INVENTOR Alberf E. Era/7f BY ,1 1/ 'v ATTORNE Patented Mar. 12, 1929 UNITED STATES PATENT OFFICE.

ALBERT E. GRANT, OF NEW YORK, N. Y.

GEAR PUMP.

Application filed August 8, 1927. Serial No. 211,825.

My invention relates to ear pumps.

The object of my invention is to provide a gear pump for pumping oil, that may be regulated to deliver more or less oil uniform- I 1y without changing the speed of motor to which it is directly attached.

A further object is to provide means whereby one of the gear wheels of the pump ma be adjusted relative to the cooperative whee from the exterior of the pump while the pump is running.

A further object is to provide an oil tight casing that will prevent leakage.

Further objects and advantages of the construction will be described, and the novel features defined in the claims.

Referrin to the drawings which form a part of this specification Fig. 1 is an end view of an electric motor with a pump embodying my invention mounted thereon and shown in vertical section. I

Fig. 2 is a side view of the the casing wall broken away pump showing to disclose the pump gears meshed together, and the means or supporting the motor shaft in the casing.

Fig. 3 is a sectional plan view of a portlon of the pump casing taken on the line 3-3 of Fig. 1.

A, mdicates an electrlc motor provided with an end cap portion A having a bearing A for the motor shaft B.

The cap A is provided with a smooth lane surface A. A casing ring C, is ormed with parallel sides each hav ng a smooth planesurface C -C respectively, (see Fig. 8). The casing ring 0 is provided with a circular bore D in which is fitted a gear pump element E, the outer 1periphery of which contacts with the wall 0 the bore D. The element E is fixed on the shaft B and its innerface abuts the surface A. The casing ring 0 is also formed with a rectangular openln F which is in open communication with t e bore D as illustrated, and two ide surfaces F 1 are formed on the inner walls thereof parallel to each other, which guide a cage or housing member G.

This housin member is substantially rectan ular in its outer face, and is provided wit a circular bore G which is open at its lower end to provide sggce for the oil inlet port H and outlet port:

indicated in dot ted lines, and to permit the gear wheel. E, to mesh with the gear wheel E which is fitted to rotate in contact with the bore (it in close relation with the wall thereof, and thereby dispense with a shaft, which reduces the cost of making the pump. Abutments I-I are formed in the ring as shown, to limit themovement of the housing-G and prevent the gear wheels E and E from jamming, and the upward movement of the housing is also limited by the abutment J at a point where the gears will still be in mesh but separated at the greatest predetermined distance.

The top of the ring C is provided with a stufling box construction K, through which extends a stem L, having a thread L to fit the corresponding thread formed in the ring, and which is provided with a laterally extending circular flange L which fits in a slot M formed in the housin and extending entirely across the same so t at the housing may be slipped into the ring C and engage the flange, after the stem has been first inserted in the chamber M and screwed u ward to the position as shown, as will is readily understood. The handle N, is then attached and by its'use the housin may be raised and lowered within the a utments limits. An outer cap 0, is provided with a plane surface P which serves as one side Wall to provide the gear chambers, and is also provided with an extension O in which is formed a bore P which is closed at its outer end and serves as an outer bearin for the shaft B. The inlet pipe is indicate b R and is connected to the boss R in whic is formed the inlet passage H.

The parts are held together by bolts S-S. Assuming that the motor is runnin at a uni form speed, to vary the amount of 011 pumped per minute the handle N is turned to lift the housing to pump a less amount of oil and is lowered to pump a maximum supply. When the housing is raised and the gears thereby separated a greater distance apart, a portion of the oil remains in the bottom of the gear between the teeth, since pockets are formed between the two adjacent teeth of one wheel and outer end. of the adjacent gear, and these pockets are of greater capacity when the gears are apart the extreme distance than when nearer to each other, and therefore the capacity of the pump may be changed while the pump is mnnmg, as W11] be readily understood. By removin the cap for driving said wheel, a housing in said 0, all the parts may be removed rom the rectangular chamber, a gear wheel carried casingC by said housing said gear wheel being in Having thus described my invention I claim as new 1. An oil pump comprising a casing having an inlet and outlet port or oil, a shaft, a gear wheel mounted on and driven by said shaft, a gear wheel in mesh with said first gear wheel and means for moving said last gear wheel to or from said first wheel to vary the volume of oil without changing the speed of the shaft said means comprising a cage carrying said last gear wheel and having a laterally extending slot formed in its upper end and a stem having a flange at its lower end resting in said slot, said stem extending through said casing and serving to raise or lower said cage and hold it in its adjusted position.

2. An oil pump comprising a casing having an inlet and an outlet for fluid, and having a cylindrical chamber, and a rectangular shaped chamber formed therein, a gear wheel in said cylindrical chamber, a shaft for driving said wheel, a cage in said rectangular chamber, a gear wheel carried by said cage, said gear wheel being in mesh with said first wheel, means for moving said cage and for holding it in its adjusted position, and means for limiting the movement of said cage to prevent the wheels from interlocking, and from unmeshing.

3. An oil pump comprising a casin having an inlet and an outlet for fiui and having a cylindrical chamber, and a rectangular shaped chamber formed therein, a gear wheel in said cylindrical chamber, a shaft mesh with said first wheel, means for moving said housing and for holding it in its adjusted position, and means for limiting the movement of said housing to prevent the wheels from interlocking, and from unmeshing, said pump construction embodying an end cap having a bore which serves as an inner bearing or said shaft; an outer cap plate; and an intermediate ring portion held therebetween and in contact therewith, which parts comprise the pump casing, and means or holding said parts together in separable relation.

4. An oil pump comprising a casing having an inlet and an outlet for a lubricant, a cylindrical and a communicating rectangular chamber formed within said casing, a gear wheel within the cylindrical chamber and a driving shaft for said gear wheel, a housing within the rectangular chamber and guided by the inner side Walls thereof and a gear wheel carried by said housin for meshing relation with the first mentloned gear, a casing ring and an outer cap secured to the casing, an adjusting stem passing through the casing ring,'sa1d stem having means for connection with said housin whereby it may be moved with its gear whee relative to the gear wheel in the cylindrical chamber to vary the volume of lubricant without changing the speed of the driven shaft.

In testimony whereof I affix my signature.

ALBERT E. GRANT. 

